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[on:]

I have an arduino with a maker shield on top and a lcd on the breadboard on the maker shield. When I plug in the 9v power jack it makes smoke and something buzzs!
Help

[Reply #1 on:]

Center of your 9v plug is positive? 

[Reply #2 on:]

idk its the one that plugs into arduino uno, same thing with usb plug

[Reply #3 on:]

You haven't really given any details to help.

Look around your circuit for the part that is burned up. 

[Reply #4 on:]

It doesnt look like any part was burnt, but I am to scared to plug it in again

[Reply #5 on:]

Did you assemble the Maker Shield yourself?  If so you might have bridged a couple of solder pads or put the wrong part in.  I'd check all the joints and parts very carefully just to be sure.

I once nearly burned out my Arduino by sticking a piece of wire between an analog in and a 5V pin with nothing in between.  It only took a second or so for one of the chips to get hot enough to burn my thumb.  I disconnected the thing before I could unleash the Magic Smoke and it still works fine, but I don't know if I'd trust it for anything 'mission critical.'

[Reply #6 on:]

It doesnt look like any part was burnt, but I am to scared to plug it in again

There is something wrong with how you wired your circuit.  Without schematics or actual descriptions using actual sentences (gasp!), there isn't going to be a magic answer.

As rujoking says, look for shorts in your circuit.

[Reply #7 on:]

Take the shield off. Still smoke?

Sniff your boards for smokey goodness.

Connect the +5 and gnd from your shield to a power source? Smoke?

[Reply #8 on:]

i cleaned the board with alchol to clean off the extra flux and it works

[Reply #9 on:]

i cleaned the board with alchol to clean off the extra flux and it works

Likely, then - you had a short somewhere, and cleaning it removed the short. Here's a tip:

Get yourself a pocket microscope, or one of those USB microscopes off ebay; in a pinch, a jeweller's loupe will work, too. Use that to inspect your work carefully after you finish soldering a circuit (or part of a circuit). You'll be able to easily see cold solder joints, joints that need more solder, and solder bridges (as well as beaded solder; as you solder, the rosin can smoke and pop, throwing small blobs of molten solder around - which is a good reason to wear goggles, btw - but anyhow, those small balls can land and cause bridging). Rework, reflow, or clean up (using a dental pick or similar) those areas that need it, then re-check your work.